Diode characteristics and applications

Semiconductor diodes are used in almost all electronic circuits. They play an important role in many circuits. They are one of the earliest semiconductor devices and are widely used.

1, rectifier diode

By using the unidirectional conductivity of the diode, the alternating current alternating in direction can be converted into a pulsating direct current in a single direction.

2, switching components

The diode has a small resistance under the action of the forward voltage and is in a conducting state, which is equivalent to a switch that is turned on. Under the action of the reverse voltage, the resistance is large and is in an off state, like an open switch. Various switching logic circuits can be used to form various logic circuits.

3. Limiting components

After the diode is turned on, its forward voltage drop remains essentially the same (0.7V for the silicon tube and 0.3V for the xenon tube). Using this feature, as a limiting component in the circuit, the signal amplitude can be limited to a certain range.

4, relay diode

It acts as a relay in the inductance of the switching power supply and in an inductive load such as a relay.

5, detection diode

It acts as a detector on the radio.

6, varactor diode

Used in the tuner of the TV.